Make Countries Move

Explore global development with R

In this exercise, you will load a filtered gapminder dataset - with a subset of data on global development from 1952 - 2007 in increments of 5 years - to capture the period between the Second World War and the Global Financial Crisis.

Your task: Explore the data and visualise it in both static and animated ways, providing answers and solutions to 7 questions/tasks within this script.

• Submit to Github this script with solutions and its knitted version.
  
• Submit to Brightspace a document with the (1) URL of this script and its knitted version in Github (2) answer of 250 words and a (3) visualisation of the Final Question

Get the necessary packages

First, start with installing and activating the relevant packages tidyverse, gganimate, and gapminder if you do not have them already. Pay attention to what warning messages you get when installing gganimate, as your computer might need other packages than gifski and av

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## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──
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Look at the data and tackle the tasks

First, see which specific years are actually represented in the dataset and what variables are being recorded for each country. Note that when you run the cell below, Rmarkdown will give you two results - one for each line - that you can flip between.

str(gapminder)

## tibble [1,704 × 6] (S3: tbl_df/tbl/data.frame)
##  $ country  : Factor w/ 142 levels "Afghanistan",..: 1 1 1 1 1 1 1 1 1 1 ...
##  $ continent: Factor w/ 5 levels "Africa","Americas",..: 3 3 3 3 3 3 3 3 3 3 ...
##  $ year     : int [1:1704] 1952 1957 1962 1967 1972 1977 1982 1987 1992 1997 ...
##  $ lifeExp  : num [1:1704] 28.8 30.3 32 34 36.1 ...
##  $ pop      : int [1:1704] 8425333 9240934 10267083 11537966 13079460 14880372 12881816 13867957 16317921 22227415 ...
##  $ gdpPercap: num [1:1704] 779 821 853 836 740 ...

unique(gapminder$year)

##  [1] 1952 1957 1962 1967 1972 1977 1982 1987 1992 1997 2002 2007

head(gapminder)

## # A tibble: 6 × 6
##   country     continent  year lifeExp      pop gdpPercap
##   <fct>       <fct>     <int>   <dbl>    <int>     <dbl>
## 1 Afghanistan Asia       1952    28.8  8425333      779.
## 2 Afghanistan Asia       1957    30.3  9240934      821.
## 3 Afghanistan Asia       1962    32.0 10267083      853.
## 4 Afghanistan Asia       1967    34.0 11537966      836.
## 5 Afghanistan Asia       1972    36.1 13079460      740.
## 6 Afghanistan Asia       1977    38.4 14880372      786.

highest_gdp_country <- subset(gapminder, year == 1952)[which.max(subset(gapminder, year == 1952)$gdpPercap), ]
highest_gdp_country

## # A tibble: 1 × 6
##   country continent  year lifeExp    pop gdpPercap
##   <fct>   <fct>     <int>   <dbl>  <int>     <dbl>
## 1 Kuwait  Asia       1952    55.6 160000   108382.

gdp_country_2007 <- subset(gapminder, year==2007)

gdp_2007_sorted <- gdp_country_2007[order(-gdp_country_2007$gdpPercap), ]

Five_richest_countries <- head(gdp_2007_sorted, 5)

Five_richest_countries

## # A tibble: 5 × 6
##   country       continent  year lifeExp       pop gdpPercap
##   <fct>         <fct>     <int>   <dbl>     <int>     <dbl>
## 1 Norway        Europe     2007    80.2   4627926    49357.
## 2 Kuwait        Asia       2007    77.6   2505559    47307.
## 3 Singapore     Asia       2007    80.0   4553009    47143.
## 4 United States Americas   2007    78.2 301139947    42952.
## 5 Ireland       Europe     2007    78.9   4109086    40676.

The dataset contains information on each country in the sampled year, its continent, life expectancy, population, and GDP per capita.

Let’s plot all the countries in 1952.

theme_set(theme_bw())  # set theme to white background for better visibility

ggplot(subset(gapminder, year == 1952), aes(gdpPercap, lifeExp, size = pop)) +
  geom_point(aes(color=continent)) +
  scale_x_log10() +
  ggtitle("Figure 01")+
  xlab("GDP per Citizen")+
  ylab("Life Expectancy")

  options(scipen = 999)

…

We see an interesting spread with an outlier to the right. Explore who it is so you can answer question 2 below!

Next, you can generate a similar plot for 2007 and compare the differences

ggplot(subset(gapminder, year == 2007), aes(gdpPercap, lifeExp, size = pop)) +
  geom_point(aes(color=continent)) +
  scale_x_log10() +
  ggtitle("Figure 02")+ 
  xlab("GDP per Citizen") +
  ylab("Life Expectancy") 

options(scipen = 999)

…

The black bubbles are a bit hard to read, the comparison would be easier with a bit more visual differentiation.

Questions for the static figures:

1. Answer: why does it make sense to have a log10 scale (scale_x_log10()) on the x axis? Answer: A log scale on the x-axis compresses the wide range of GDP values, preventing high-GDP outliers from overshadowing lower-GDP countries and revealing meaningful patterns across all income levels.

2. Answer: In Figure 1: Who is the outlier (the richest country in 1952) far right on the x axis? Kuwait

3. Fix Figures 1 and 2: Differentiate the continents by color, and fix the axis labels and units to be more legible (Hint: the 2.50e+08 is so called “scientific notation”. You want to eliminate it.) aes(color = continent).

4. Answer: What are the five richest countries in the world in 2007? Norway
   Kuwait
   Singapore
   United States Americas
   Ireland Europe

Make it move!

The comparison would be easier if we had the two graphs together, animated. We have a lovely tool in R to do this: the gganimate package. Beware that there may be other packages your operating system needs in order to glue interim images into an animation or video. Read the messages when installing the package.

Also, there are two ways of animating the gapminder ggplot.

Option 1: Animate using transition_states()

The first step is to create the object-to-be-animated

anim <- ggplot(gapminder, aes(gdpPercap, lifeExp, size = pop)) +
  geom_point(aes(color=continent)) +
  scale_x_log10()  # convert x to log scale
anim +
  xlab("GDP per Citizen") +
  ylab("Life Expectancy") 

options(scipen = 999)

…

This plot collates all the points across time. The next step is to split it into years and animate it. This may take some time, depending on the processing power of your computer (and other things you are asking it to do). Beware that the animation might appear in the bottom right ‘Viewer’ pane, not in this rmd preview. You need to knit the document to get the visual inside an html file.

anim + transition_states(year, 
                      transition_length = 1,
                      state_length = 1) +
  xlab("GDP per Citizen") +
  ylab("Life Expectancy") 

…

Notice how the animation moves jerkily, ‘jumping’ from one year to the next 12 times in total. This is a bit clunky, which is why it’s good we have another option.

Option 2 Animate using transition_time()

This option smooths the transition between different ‘frames’, because it interpolates and adds transitional years where there are gaps in the timeseries data.

anim2 <- ggplot(gapminder, aes(gdpPercap, lifeExp, size = pop, color = continent)) +
  geom_point(alpha = 0.7) +
  scale_x_log10(labels = scales::comma) +
  scale_y_continuous(labels = scales::comma) +  
  scale_size(range = c(2, 12)) +
  labs(title = "Year: {frame_time}",  
       x = "GDP per Capita (log scale)",
       y = "Life Expectancy (years)",
       size = "Population",
       color = "Continent") +
  theme_minimal() +
  theme(
    legend.position = "right",
    text = element_text(size = 14)  
  ) +
  transition_time(year) +  
  ease_aes('linear')  


ggplot(gapminder, aes(x = gdpPercap, y = lifeExp, size = pop, color = continent)) +
  geom_point(alpha = 0.7) +
  scale_x_log10(labels = scales::comma) +
  scale_y_continuous(labels = scales::comma) +  
  scale_size(range = c(2, 12)) +
  labs(title = "GDP per Capita vs Life Expectancy in {closest_state}",
       x = "GDP per Capita (log scale)",
       y = "Life Expectancy (years)",
       size = "Population",
       color = "Continent") +
  theme_minimal() +
  transition_states(year, transition_length = 1, state_length = 1)

# Animate using transition_time
anim2 <- ggplot(gapminder, aes(gdpPercap, lifeExp, size = pop, color = continent)) +
  geom_point(alpha = 0.7) +
  scale_x_log10(labels = scales::comma) +  
  scale_y_continuous(labels = scales::comma) +  
  scale_size(range = c(2, 12)) +  
  labs(title = "Year: {frame_time}",  
       x = "GDP per Capita (log scale)",  
       y = "Life Expectancy (years)",  
       size = "Population",  
       color = "Continent") + 
  theme_minimal() +
  theme(
    legend.position = "right",  
    text = element_text(size = 14)  
  ) +
  transition_time(year) 
  ease_aes('linear')

## <ggproto object: Class EaseAes, gg>
##     aes_names: 
##     aesthetics: 
##     default: linear
##     get_ease: function
##     super:  <ggproto object: Class EaseAes, gg>

  birth_year <- 1982

gapminder %>%
  filter(year %in% c(birth_year, 2007)) %>%
  group_by(year) %>%
  summarise(
    avg_lifeExp = mean(lifeExp, na.rm = TRUE),
    avg_gdpPercap = mean(gdpPercap, na.rm = TRUE),
    avg_pop = mean(pop, na.rm = TRUE)
  )

## # A tibble: 2 × 4
##    year avg_lifeExp avg_gdpPercap   avg_pop
##   <int>       <dbl>         <dbl>     <dbl>
## 1  1982        61.5         7519. 30207302.
## 2  2007        67.0        11680. 44021220.

ggplot(gapminder %>% filter(year %in% c(birth_year, 2007)), 
       aes(x = factor(year), y = lifeExp, fill = continent)) +
  geom_boxplot() +
  labs(title = "Life Expectancy in My Birth Year vs 2007",
       x = "Year",
       y = "Life Expectancy (years)",
       fill = "Continent") +
  theme_minimal()

The much smoother movement in Option 2 will be much more noticeable if you add a title to the chart, that will page through the years corresponding to each frame.

Now, choose one of the animation options and get it to work. You may need to troubleshoot your installation of gganimate and other packages

Tasks for the animations:

5. Can you add a title to one or both of the animations above that will change in sync with the animation? (Hint: search labeling for transition_states() and transition_time() functions respectively) I added labs(title = “Year: {frame_time}”)

6. Can you made the axes’ labels and units more readable? Consider expanding the abbreviated labels as well as the scientific notation in the legend and x axis to whole numbers. Also, differentiate the countries from different continents by color

Final Question

7. Is the world a better place today than it was in the year you were born? Based on the data from 1982 and 2007, we can see that the world has become a better place in several ways, but not for everyone equally. First, looking at life expectancy, people in 2007 lived longer than in 1982. The average life expectancy in 1982 was around 60 years, while in 2007, it was about 67 years. This means that healthcare, better living conditions, and advancements in medicine have helped people live longer lives. Next, when we look at GDP per capita, which is how much money a person makes on average, it shows that the world has gotten richer. In 1982, the average GDP per capita was lower than in 2007. This shows that many countries became wealthier over time, and more people were able to afford better things like food, housing, and education.However, not all countries improved at the same rate. While some countries like the United States, Norway, and Japan became wealthier and had better healthcare, some countries in Africa, for example, still faced challenges like poverty and disease. In conclusion, the world has become more prosperous and healthier since 1982, but the benefits haven’t been shared equally. Some countries have improved a lot, but others still face challenges that need to be addressed for everyone to have a better life.